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Synthesis of SiOx Nano-Powders Using a Microwave Plasma Torch at Atmospheric Pressure

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Soft Nanoscience Letters 2016年第2期6卷 31-36页

作者： Dong Hun Shin yun seok choi Dong Jin Ku Yong Cheol Hong Bong Ju Lee Department of Advanced Green Energy Environment Handong Global University Pohang Korea Plasma Technology Research Center National Fusion Research Institute Gunsan Korea Department of Advanced Green Energy Environment Handong Global University Pohang Korea

The silicon oxide nano-powders (SiOx-NPs) were obtained in an atmospheric microwave plasma torch using a gas-phase silicon tetrachloride (SiCl4) with N2 and H2. The gas-phase SiCl4 was injected with H2 gas into the microwave plasma torch generated by N2 and air swirl gas, and then the dark brown powders were deposited on the inner wall of a quartz tube. The sample was analyzed by an X-ray photoelectron spectroscopy (XPS), a scanning electron microscope (SEM), an energy dispersive spectrometer (EDS), and an X-ray diffraction (XRD). The average size and oxidation x values of synthesized SiOx-NPs were approximately 230 nm and 0.91, respectively. Furthermore, the volumetric charge capacity is 1127 mAh/g and has 89.2% retention after 100 cycles.

关键词： Silicon Oxide Secondly Battery Microwave Plasma Torch Volumetric Charge Capacity Oxidation Value

Pediatric schwannoma of the tongue:A case report and review of literature

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World Journal of Clinical Cases 2021年第24期9卷 7212-7217页

作者： Chang Bin yun Young-Mo Kim Jeong-seok choi Ji Won Kim Department of Otorhinolaryngology-Head and Neck Surgery Inha University College of MedicineIncheon 22212South Korea

BACKGROUND Neurogenic tumors account for about ten percent of all tumors of childhood,and benign tumor originating from Schwann cells is rare in peripheral *** of the tongue is quite rare in *** SUMMARY We present the case of an 8-year-old male with schwannoma in the anterolateral *** mass was slow-growing for one year with no pain and *** underwent transoral mass excision under general *** examination revealed a smooth surfaced,17 mm×14 mm×7 mm sized,encapsulated nodule with a clear resection *** of the tongue was confirmed by the pathological *** reported no motor or sensory change,such as dysgeusia or paresthesia,or phonation difficulty during postoperative 12 mo *** Schwannoma of the tongue is a rare benign neoplasm in *** a painless firm mass is encountered in the tongue of a child,solid tumors like schwannoma should be considered in the differential diagnosis.

关键词： Schwannoma Tongue Child Pediatric Neurogenic Tumor Case report

Inhomogeneous lithium-storage reaction triggering the inefficiency of all-solid-state batteries

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Journal of Energy Chemistry 2022年第3期31卷 226-236,I0008页

作者： Jaeyoung Kim Wontae Lee Jangwhan seok Eunkang Lee Woosung choi Hyunyoung Park Soyeong yun Minji Kim Jun Lim Won-Sub Yoon Department of Energy Science Sungkyunkwan UniversitySuwon 16419South Korea Pohang Accelerator Laboratory Pohang University of Science and TechnologyPohang 37673South Korea

All-solid-state batteries offer an attractive option for developing safe lithium-ion *** the various solid-state electrolyte candidates for their applications,sulfide solid electrolytes are the most suitable owing to their high ionic conductivity and facile ***,their performance is extensively lower compared with those of conventional liquid electrolyte-based batteries mainly because of interfacial reactions between the solid electrolytes and high capacity ***,the kinetic evolution reaction in the composite cathode of all-solid-state lithium batteries has not been actively ***,electrochemical analyses were performed to investigate the differences between the organic liquid electrolyte-based battery and all-solid-state battery *** with electrochemical analyses and synchrotron-based in situ and ex situ X-ray analyses,it was confirmed that inhomogeneous reactions were due to physical *** contacted and/or isolated active material particles account for the inhomogeneously charged regions,which further intensify the inhomogeneous reactions during extended cycles,thereby increasing the polarization of the *** study highlighted the benefits of electrochemo-mechanical integrity for securing a smooth conduction pathway and the development of a reliable homogeneous reaction system for the success of solid-state batteries.

关键词： Liquid electrolyte lithium batteries All-solid-state lithium batteries Ni-rich cathode Synchrotron-based X-ray techniques Inhomogeneous reaction

Expert recommendation system based on analyzing expertise and networks of human resources in National Science & Technology Information Service

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Journal of Central South University 2013年第8期20卷 2212-2218页

作者： YANG Myung-seok KANG Nam-kyu KIM yun-jeong KIM Jae-soo choi Kwang-nam KIM Young-kuk NTIS Center Korea Institute of Science and Technology Information Department Of Computer Science and Engineering Chungnam National University

This work aims to implement expert and collaborative group recommendation services through an analysis of expertise and network relations NTIS. First of all, expertise database has been constructed by extracting keywords after indexing national R＆D information in Korea （human resources, project and outcome） and applying expertise calculation algorithm. In consideration of the characteristics of national R＆D information, weight values have been selected. Then, expertise points were calculated by applying weighted values. In addition, joint research and collaborative relations were implemented in a knowledge map format through network analysis using national R＆D information.

关键词： human networks network analysis NTIS R&D information

VColor^(*):a practical approach for coloring large graphs

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Frontiers of Computer Science 2021年第4期15卷 133-149页

作者： yun PENG Xin LIN Byron choi Bingsheng HE Department of Computer Science Hong Kong Baptist UniversityHong Kong 999077China School of Computer Science and Technology East China Normal UniversityShanghai 200062China School of Computing National University of SingaporeSingapore 119077Singapore

Graph coloring has a wide range of real world applications,such as in the operations research,communication network,computational biology and compiler optimization *** our recent work[1],we propose a divide-andconquer approach for graph coloring,called *** an approach has three generic subroutines.(i)Graph partition subroutine:VColor partitions a graph G into a vertex cut partition(VP),which comprises a vertex cut component(VCC)and small non-overlapping connected components(CCs).(ii)Component coloring subroutine:VColor colors the VCC and the CCs by efficient algorithms.(iii)Color combination subroutine:VColor combines the local colors by exploiting the maximum matchings of color combination bigraphs(CCBs).VColor has revealed some major bottlenecks of efficiency in these ***,in this paper,we propose VColor^(*),an approach which addresses these efficiency bottlenecks without using more colors both theoretically and *** technical novelties of this paper are the following.(i)We propose the augmented VP to index the crossing edges of the VCC and the CCs and propose an optimized CCB construction algorithm.(ii)For sparse CCs,we propose using a greedy coloring algorithm that is of polynomial time complexity in the worst case,while preserving the approximation ratio.(iii)We propose a distributed graph coloring *** extensive experimental evaluation on real-world graphs confirms the efficiency of VColor^(*).In particular,VColor^(*)is 20X and 50X faster than VColor and uses the same number of colors with VColor on the Pokec and PA datasets,***^(*)also significantly outperforms the state-ofthe-art graph coloring methods.

关键词： graph coloring approximation algorithm distributed algorithm

Aerosol-assisted rapid synthesis of SnS-C composite microspheres as anode material for Na-ion batteries

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Nano Research 2015年第5期8卷 1595-1603页

作者： Seung Ho choi yun Chan Kang Department of Materials Science and Engineering Korea University Anam-Dong Seongbuk-Gu Seou1136-713 Republic of Korea

SnS-C composite powders were prepared through one-pot spray pyrolysis for use as anode materials for Na-ion batteries. C microspheres with uniformly attached cubic-like SnS nanocrystals, which have an amorphous C coating layer, were formed at a preparation temperature of 900 ℃. The initial discharge capacities of the bare SnS and SnS-C composite powders at a current density of 500 mA·g^-1 were 695 and 740 mA·h·g^-1, respectively. The discharge capacities after 50 cycles and the capacity retentions measured from the second cycle of the bare SnS and SnS-C composite powders were 25 and 433 mA.h.g-1 and 5 and 89%, respectively. The prepared SnS-C composite powders with high reversible capacities and good cycle performance can be used as Na-ion battery anode materials.

关键词： tin sulfide anode material carbon composite sodium battery energy storage

Enhanced Li^＋ storage properties of few-layered MoS2-C composite microspheres embedded with Si nanopowder

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Nano Research 2015年第8期8卷 2492-2502页

作者： Seung Ho choi yun Chan Kang Department of Materials Science and Engineering Korea University Anam-Dong Seongbuk-Gu Seoul 136-713 Republic of Korea

A few-layered MoS2-C composite material is studied as a supporting material for silicon nanopowder. Microspheres of the few-layered MoS2-C composite embedded with 30 wt.% Si nanopowder are prepared by one-pot spray pyrolysis. The Si nanopowder particles with high capacity are completely surrounded by the few-layered MoS2-C composite matrix. The discharge capacities of the MoS2-C composite microspheres with and without 30 wt.% Si nanopowder after 100 cycles are 1,020 and 718 mAh·g^-1 at a current density of 1,000 mA·g^-1 respectively. The spherical morphology of the MoS2-C composite microspheres embedded with Si nanopowder is preserved even after 100 cycles because of their high structural stability during cycling. The MoS2-C composite layer prevents the formation of unstable solid-electrolyte interface （SEI） layers on the Si nanopowder. Furthermore, as the MoS2-C composite matrix exhibits high capacity and excellent cycling performance, these characteristics are also reflected in the MoS2-C composite microspheres embedded with 30 wt.% Si nanopowder.

关键词： molybdenum sulfide silicon anode material lithium batteries spray pyrolysis

Hepatectomy vs radiofrequency ablation for colorectal liver metastasis:A propensity score analysis

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World Journal of Gastroenterology 2015年第11期21卷 3300-3307页

作者： Huisong Lee Jin seok Heo Yong Beom Cho Seong Hyeon yun Hee Cheol Kim Woo Yong Lee Seong Ho choi Dong Wook choi Department of Surgery Samsung Medical CenterSungkyunkwan University School of Medicine

AIM:To compare outcomes from radiofrequency ablation(RFA) and hepatectomy for treatment of colorectal liver metastasis(CRLM).METHODS:From January 2000 to December 2009,408 patients underwent curative intent treatment for *** excluded patients using the criteria:size of CRLM > 3 cm,number of CRLM ≥ 5,percutaneous RFA,follow-up period 2 cm) CRLM(P = 0.034).However,survival curves were similar for single or small(≤ 2 cm) CRLM(P = 0.714,P = 0.740).CONCLUSION:Hepatectomy is better than RFA for the treatment of ***,RFA might be suitable for selected patients with single,small(≤ 2 cm) CRLM.

关键词： Colorectal neoplasm Metastasis Catheter ablation H

Effect of preoperative biliary drainage on surgical results after pancreaticoduodenectomy in patients with distal common bile duct cancer:Focused on the rate of decrease in serum bilirubin

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World Journal of Gastroenterology 2008年第7期14卷 1102-1107页

作者： yun Mee choi Eung-Ho Cho Keon-Young Lee Seung-Ik Ahn Sun Keun choi Sei Joong Kim Yoon seok Hur Young Up Cho Kee-Chun Hong seok-Hwan Shin Kyung Rae Kim Ze-Hong Woo Department of Surgery College of MedicineInha UniversityIncheonKorea

AIM: To examine if the rate of decrease in serum bilirubin after preoperative biliary drainagecan be used as a predicting factor for surgical complications and postoperative recovery after pancreaticoduodenectomy in patients with distal common bile duct ***: A retrospective study was performed in 49 consecutive patients who underwent pancrea-ticoduodenectomy for distal common bile duct cancer. Potential risk factors were compared between the complicated and uncomplicated groups. Also, the rates of decrease in serum bilirubin were compared pre- and postoperatively. RESULTS: Preoperative biliary drainage (PBD) was performed in 40 patients (81.6%). Postoperative morbidity and mortality rates were 46.9% (23/49) and 6.1% (3/49), respectively. The presence or absence of PBD was not different between the complicated and uncomplicated groups. In patients with PBD, neither the absolute level nor the rate of decrease in serum bilirubin was significantly different. Patients with rapid decrease preoperatively showed faster decrease during the first postoperative week (5.5 ± 4.4 μmol/L vs -1.7 ± 9.9 μmol/L, P = 0.004).CONCLUSION: PBD does not affect the surgical outcome of pancreaticoduodenectomy in patients with distal common bile duct cancer. There is a certain group of patients with a compromised hepatic excretory function, which is represented by the slow rate of decrease in serum bilirubin after PBD.

关键词： Distal bile duct cancer Drainage Bilirubin Rate